shenweishi/wxcomponents/vant/common/utils.js

export function isDef(value) {
    return value !== undefined && value !== null;
}
export function isObj(x) {
    const type = typeof x;
    return x !== null && (type === 'object' || type === 'function');
}
export function isNumber(value) {
    return /^\d+$/.test(value);
}
export function range(num, min, max) {
    return Math.min(Math.max(num, min), max);
}
export function nextTick(fn) {
    setTimeout(() => {
        fn();
    }, 1000 / 30);
}
let systemInfo = null;
export function getSystemInfoSync() {
    if (systemInfo == null) {
        systemInfo = wx.getSystemInfoSync();
    }
    return systemInfo;
}
export function requestAnimationFrame(cb) {
    const systemInfo = getSystemInfoSync();
    if (systemInfo.platform === 'devtools') {
        return setTimeout(() => {
            cb();
        }, 1000 / 30);
    }
    return wx
        .createSelectorQuery()
        .selectViewport()
        .boundingClientRect()
        .exec(() => {
        cb();
    });
}